Core-mold.



C. D. lVIcARTHUR.

CORE MOLD.

APPLICATION FILED MAYI, 191s.

1Q I, 141. 9 1. I. Patented June 1, 1915.

2 SHEETS-SHEET I.

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CORE MOLD.

APPLICATION FILED MAI/7.1913.

Patented June 1, 1915.

l 9 4 l 9 l II I I INVENTOR v WITNESSES THE NDFR/s PETERS CO.. PHOTO-LITHO., WASHINGTON. D. t.

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CHARLES I). MCARTHUR, V0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO BLAW STEEL CONSTRUCTION COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

CORE-MOLD.

Application filed May 7, 1913.

T0 all 'whom t may concern Be it known that I, CHARLES D. MC- ARTHUR, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Core-Molds, of which the following is a specification.

The invention relates to core molds for use in the formation of hollow concrete walls, poles, or in fact any type of concrete or tile requiring a removable core. The invention has for its primary objects, the provision of a core which can be easily assembled and disassembled, and the provision of a core of simple construction which is stili and reliable in operation and in which the parts are detachable so that the core may be removed in sections from the position of use. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein- Fig. 1 is a side elevation of the mold, Fig. 2 is an end elevation of the mold on an enlarged scale, with the handle of the operating rod broken away, Fig. 3 is an enlarged section at the end of one of the side walls of the mold, Fig. 4 is an end view of a modified type of construction, Fig. 5 is a side elevation of the construction of Fig. 4, Fig. 6 is a section on the line VI-VI of Fig. 5, and Figs. 7 and 8 are end and side elevation views respectively of another modified type of construction.

The invention may be embodied in core molds of different cross section, and the number of sides and their shape may be varied to suit requirements. In its preferred embodiment the mold comprises walls built up of two plates alternating with single plates, the edges of the single plates being gripped between the inner and outer plates of the double plate walls. The plates of the two-plate sections or walls are releasably secured together so that after the concrete has set about the mold the inner plates can be released and removed, thus releasing all of the other plates in the construction.

Referring to Fig. 2, it will be seen that the mold or form is made up of four walls, the right and left hand walls 1 and 2 being a single metal plate, while the other two walls are each composed of two plates 3 and` 4 be- Specicaton of Letters Patent.

Patented J une 1, 1915.

Serial No. 766,043.

tween which the edges of the plates 1 and 2 are yieldingly gripped. As indicated in Fig. l, the two plates 3 and 4 are releasably connected together at a plurality of points along their length, the method of connection being indicated most clearly in Fig. 3 when taken in connection with Fig. 2. By reference to Fig. 3 it will be seen that the inner plate 3 is provided with a pair of perforations 5, and that the outer plate 4 has riveted to it a pair of loops 6 which project through the perforations 5. Lying against the face of the inner plate 3 is a rectangular plate 7 provided with the pair of locking lugs 8 adaptedy to engage the loops 6 and lock the plates 3 and 4 together. Lying over the plate 7 is the operating rod 9, and fitting over the operating rod is the rectangular plate 10 separated from the plate 7 by the spacing strips 11, the parts 7, 10, and 11 being secured together by means of the rivets 12.

By the foregoing arrangement the oper` ating rod is slidably mounted with respect to the plates 7 and 10, but this sliding movement is limited by means of the rivets 13 and 14 whose outer ends project above the surface of the rod and are adapted to engage the ends of the plate 10. rIhe rod 9 is guided upon the plate 3 by means of a plurality of straps 14, and the foregoing description of the locking means between the plates 3 and 4 and illustrated in Fig. 3, is applicable to each of the four locking means shown in Fig. 1 and spaced at proper intervals along the mold. When it is desired to release the locking lugs 8 from the loops 6 and thus permit the disengagement of the inner plate 3 from the plate 4, the handle 15 of the operating rod 9 is grasped and pulled upward, thus causing the rivets 13 to engage the plates 10 and move the lugs 8 through the loops 6. When it is desired to secure the plates 3 and 4 together the plates 10 can be adjusted to locking position independently of each other, due to the lost motion connection between the locking means and the rod 9. This renders the locking of the parts together more convenient, as it would be somewhat diiiicult to move all of the locking lugs 8 simultaneously to locking position as would be the case if the locking means were all secured rigidly to the operating rod 9, and did not have the lost motion connection as heretofore described. The plates 3 and 4 are preferably so bent with respect to each other that when the two plates are locked togetherby means ofthe lugs 8 and loops 6, the opposing edge surfaces of the plates will yieldingly grip the edges of the plates 1 and 2 and hold such plates in position without the necessity of using other securing means. If this gripping action is not suiiicient a wire may be wound around the outside of the mold to insure the parts remaining in position until the concrete is applied. In such case the wire would remain embedded in the concrete after the mold was removed.

In assembling the mold shown in Figs. 1, 2, and 3, the preferred procedure is to first secure the plates 3 and 4 together by means of the lugs 8, and loops 6, after which the plates 1 and 2 may be positioned by forcing their edges between the edges of the as'- sembled'plates 3 and 4. After the concrete has set about the mold the handles 15 of the rods 9 are moved upward, thus releasing the lugs 8 from the loops 6, and Ydisengaging the plates 3 and 4. The plates 3-3 are then removed, after which the plates 1 and 2 Vand can be disengaged from the yconcrete and removed therefrom. The plates 1 and 2 are prevented from moving in too ing carried directly upon the operating rods instead of having lost motion connection therewith as in the construction of Figs. 1, 2, and 3. By reference to Fig. 4 it will Vbe seen that' four single sheet corner plates l-l--lZ-? are employed, and that between these plates are interspersed the main side walls composed of the plates 18 and 19. The opposing surfaces of the plates 18 and 19 grip the edges of the plates 17 as in the other type of construction, andthe inner plates 119 are provided with perforations to receive the loops 20 riveted to the plates 18. Locking rod 21 is provided with a plurality of locking lugs 22 engaging the openings in the members 20, and the plates are disengagedV by moving the rod 21 upwardly, withdrawing the lugs-22 from the `mem bers 2,0. As indicated in Fig. 5, the backs of lthe members .20 are of such width that their side .edges form stops for the edges of the plates 17. The operation of the device is `substantially the same as that heretofore indicated with respect to the construction of Figs. 1, 2, and '3.

Figs. 7 and 8 illustrate a modified type of construction which differs from that of Figs. 4, 5, and 6, only in that the plates forming the side walls are so bent as to provide a core circular in cross section instead of rectangular. Four single plates or walls 23-2323-23 are employed having their side edges gripped between the surfaces of the plates 24 and 25 constituting the double walls. The outer plates 24 are provided with the perforated members 26 projecting through perforations in the inner plates 25, and the parts are locked together by means of an operating rod 27 provided with lugs 26 corresponding in all respects to the parts 21 and 22 of Figs. 4, 5, and 6. The cross section of the mold and the number of sides may easily be varied to suit conditions, the only requirement being that the double walls alternate with the single walls, with the edges of the single walls fitting between the surfaces of the double walls after the two plates of the double walls are releasably secured together.

What I claim is:

1. In combination, a core comprising alternate walls each consisting of an inner and an outer plate, means releasably securing said plates together and having opposing spring edges, and other walls interposed between such alternate walls and having their side edges yieldingly gripped between the spring edges of the said inner and outer plates.

2. In combination, a core comprising alternate walls each consisting of an inner and an outer plate having opposing spring edges, the inner plate being provided with perforations, means carried by the outer plates and projecting through the perforations, locking means for engaging the first mentioned means and securing the inner and outer plates together, and other walls interposed between such alternate walls and having their side edges yieldingly gripped between the spring edges of said inner and outer plates.

3. In combination, a core comprising alternate walls each consisting of an inner and an outer plate, the inner plate being provided wthperforations, means carried by the outer plates and projecting through the perforations, slide locking members for engaging the first mentioned means and securing the inner and outer plates together, a member extending longitudinally of the interior of the core for operating the locking members, and other walls interposed between such alternate walls and having theirside edges releasably held between the said inner and outer plates.

4. In combination, a core comprising alternate walls each consisting of an inner and an outer plate, the inner plate being provided with perforations, means carried by the outer plates and projecting through the perforations, slide locking members for engaging the first mentioned means and securing the inner and outer plates together, a member extending longitudinally of the interior of the core and having a lost motion Connection with the locking members, and other walls interposed between such alternate walls and having their side edges releasably held between the said inner and 10 outer plates.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

CHARLES D. MCARTHUR.

Witnesses:

LnTrrIA A. MYERS, ARCHWORTH MARTIN.

Gomes of this patent may be obtained for ve cents each, by addressing the Commissioner of Patente, Washington, D. G. 

